(Answered) Any idea what equation was used for this problem1 a

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Any idea what equation was used for this problem?

1. A researcher fails to find a significant different in mean blood pressure in 36 matched pairs. The standard deviation of the difference was 5 mmHg. What was the power of the test to find a mean difference of 2.5 mmHg at α = 0.05 (two-sided)?

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